INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 4,669	$ 7,396
Less than 12 months, gross unrealized losses	64	349
12 months or longer, fair value	439	665
12 Months or Longer, Gross unrealized Losses	39	32
Fair value	5,108	8,061
Gross unrealized losses	103	381
Corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	2,773	2,669
Less than 12 months, gross unrealized losses	52	41
12 months or longer, fair value	332	366
12 Months or Longer, Gross unrealized Losses	32	20
Fair value	3,105	3,035
Gross unrealized losses	84	61
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	881	4,245
Less than 12 months, gross unrealized losses	5	305
12 months or longer, fair value	0	2
12 Months or Longer, Gross unrealized Losses	0	0
Fair value	881	4,247
Gross unrealized losses	5	305
States and political subdivisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value		123
Less than 12 months, gross unrealized losses		3
12 months or longer, fair value		0
12 Months or Longer, Gross unrealized Losses		0
Fair value		123
Gross unrealized losses		3
Foreign governments
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	153	11
Less than 12 months, gross unrealized losses	2	0
12 months or longer, fair value	20	47
12 Months or Longer, Gross unrealized Losses	4	5
Fair value	173	58
Gross unrealized losses	6	5
Asset-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	809	319
Less than 12 months, gross unrealized losses	4	0
12 months or longer, fair value	76	201
12 Months or Longer, Gross unrealized Losses	1	2
Fair value	885	520
Gross unrealized losses	5	2
Redeemable preferred stock
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	53	29
Less than 12 months, gross unrealized losses	1	0
12 months or longer, fair value	11	49
12 Months or Longer, Gross unrealized Losses	2	5
Fair value	64	78
Gross unrealized losses	$ 3	$ 5

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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